TWI815705B - Wireless power transmission device and operation method thereof - Google Patents

Abstract

A wireless power transmission device includes a transmission device and a control device. The control device generates a driving signal to the transmission device in a first soft-start period, so as to drive the transmission device. The control device measures an energy message generated by the transmission device to generate a measurement result in a measurement period, and calculates a signal parameter according to the measurement result. The control device accordingly generates a carrier signal according to the signal parameter obtained by the measurement period in a second soft-start period. In a transmission period, the carrier signal is transmitted to the wireless power receiving device through the transmission device. The energy message is generated by the transmission device in response to a distance between the transmission device and the wireless power receiving device.

Description

Wireless power transmission device and operation method thereof

The present invention relates to a transmission device, and in particular to a wireless power transmission device and an operating method thereof.

Generally speaking, in a wireless power transmission system, the wireless power transmission end provides a fixed energy carrier wave to the wireless power receiving end so that the wireless power receiving end can operate. However, since the distance between the wireless power transmitting end and the wireless power receiving end will vary (that is, it is not fixed), if the wireless power transmitting end still provides a fixed energy carrier wave to the wireless power receiving end, this will cause wireless power reception. The distance between the wireless power receiving end and the wireless power transmission end is close, causing the wireless power receiving end to receive a carrier wave with stronger energy and malfunctioning, or the distance between the wireless power receiving end and the wireless power transmission end is far, causing the wireless power receiving end to malfunction. The carrier reception quality at the terminal is poor.

Therefore, how to effectively provide carriers with appropriate energy is an important issue at present.

The present invention provides a wireless power transmission device and an operating method thereof, thereby adaptively providing a suitable carrier signal according to changes in the distance between the wireless power transmission device and the wireless power receiving device to increase convenience in use.

The invention provides a wireless power transmission device, which includes a transmission device and a control device. The control device generates a driving signal to the transmission device during the first soft start period to drive the transmission device. During the measurement period, the energy information of the transmission device is measured to generate a measurement result, and the signal parameters are calculated based on the measurement result. , during the second soft start period, a carrier signal is generated correspondingly according to the signal parameters obtained during the measurement period, and during the transmission period, the carrier signal is modulated through the transmission device and transmitted to the wireless power receiving device. The energy information is generated by the transmitting device in response to the distance between the transmitting device and the wireless power receiving device.

The invention provides an operating method of a wireless power transmission device, which includes the following steps. During the first soft start period, a driving signal is generated to the transmission device to drive the transmission device. During the measurement, the energy information of the transmission device is measured to generate a measurement result, and the signal parameters are calculated based on the measurement result. The energy information is generated by the transmission device in response to the distance between the transmission device and the wireless power receiving device. of. During the second soft start period, a carrier signal is generated correspondingly according to the signal parameters obtained during the measurement period. During transmission, the carrier signal is modulated by the transmission device and transmitted to the wireless power receiving device.

The wireless power transmission device and its operating method disclosed in the present invention drive the transmission device by generating a driving signal to the transmission device during the first soft start period. During the measurement period, the energy information of the transmission device is measured to generate measurement results, and signal parameters are calculated based on the measurement results. During the second soft start period, a carrier signal is generated correspondingly according to the signal parameters obtained during the measurement period. During transmission, the carrier signal is modulated by the transmission device and transmitted to the wireless power receiving device. In this way, appropriate carrier signals can be effectively provided adaptively according to changes in the distance between the wireless power transmission device and the wireless power receiving device, thereby increasing convenience of use.

100: Electronic devices

110:Wireless power transmission device

120,152:Transmission device

121:Inverter

122: Coil unit

130,156:Control device

131: Sensing module

132:Switch module

133:Control module

134:Driver module

135: Processing module

136: Sensing resistor

137:Current sensor

138:Voltage sensor

139:Converter

140:Power supply unit

150:Wireless power receiving device

154: Rectifier device

158:Adjustment device

160:Load

170:door

180:Door frame

D1: distance

T1: first soft start period

T2: Measurement period

T3: Second soft start period

T4: During transmission

S502~S508, S602~S606: steps

Figure 1 is a schematic diagram of an electronic device according to an embodiment of the present invention.

FIG. 2 is a circuit block diagram of an electronic device according to an embodiment of the present invention.

Figure 3 is an operation sequence diagram of a wireless power transmission device according to an embodiment of the present invention.

FIG. 4A is a schematic diagram illustrating the corresponding relationship between the measured voltage or measured current and the frequency of the signal parameters according to the measurement results according to an embodiment of the present invention.

FIG. 4B is a schematic diagram of the corresponding relationship between the measured voltage or measured current and the duty cycle of the signal parameter according to the measurement results according to an embodiment of the present invention.

FIG. 4C is a schematic diagram illustrating the corresponding relationship between the measured voltage or measured current and the applied voltage of the signal parameter according to an embodiment of the present invention.

FIG. 5 is a flow chart of an operating method of a wireless power transmission device according to an embodiment of the present invention.

FIG. 6 is a flow chart of an operating method of a wireless power transmission device according to another embodiment of the present invention.

The technical terms in this specification refer to the idioms in the technical field. If there are explanations or definitions for some terms in this specification, the explanation or definition of this part of the terms shall prevail. Each embodiment of the present disclosure has one or more technical features. Under the premise that implementation is possible, a person with ordinary skill in the art can selectively implement some or all of the technical features in any embodiment, or selectively combine some or all of the technical features in these embodiments.

In each of the embodiments listed below, the same or similar elements or components will be represented by the same reference numerals.

Figure 1 is a schematic diagram of an electronic device according to an embodiment of the present invention. FIG. 2 is a circuit block diagram of an electronic device according to an embodiment of the present invention. In this embodiment, the electronic device 100 is, for example, an electronic lock, and the electronic device 100 can be disposed on the door 170 and the door frame 180 , but the embodiment of the present invention is not limited thereto. Referring to FIGS. 1 and 2 , the electronic device 100 may include a wireless power transmission device 110 and a wireless power receiving device 150 . In this embodiment, the wireless power transmission device 110 is fixed on the door frame, for example. 180, the wireless power receiving device 150 is, for example, disposed on the door 170, and can move as the door 170 opens or closes.

The wireless power transmission device 110 may include at least a transmission device 120 and a control device 130 . Further, the transmission device 120 may include an inverter 121 and a coil unit 122. In this embodiment, the inverter 121 is, for example, a half-bridge inverter or a full-bridge inverter, but the embodiment of the present invention is not limited thereto. The coil unit 122 may be coupled to the inverter 121 to transmit the carrier signal to the wireless power receiving device 150 . In addition, the above-mentioned carrier signal is, for example, a carrier signal having digital information (digital ping).

The control device 130 is coupled to the transmission device 120 . Furthermore, the control device 130 may include a sensing module 131, a switch module 132, a control module 133, a driving module 134 and a processing module 135. The sensing module 131 is coupled to the transmission device 120 and measures the energy information of the transmission device to generate a measurement result. The switch module 132 receives the power signal. The control module 133 is coupled to the switch module 132 and controls the switch module 132 to turn on or off the switch module 132 . In this embodiment, the control module 133 is, for example, a microcontroller. In addition, the driving module 134 is, for example, a pulse width modulator (pulse width modulator, PWM).

The processing module 135 is coupled to the sensing module 131, the control module 133 and the driving module 134. The processing module 135 can control the driving module 134 and the control module 133 to generate a driving signal to the transmission module 120 so as to drive the transmission module 120 . The processing module 135 can calculate signal parameters based on the measurement results of the sensing module 131, and control the driving module 134 and the control module 133 to generate carrier signals based on the signal parameters. In this embodiment, the processing module 135 is, for example, a microprocessor.

The wireless power receiving device 150 may include a transmission device 152, a rectification device 154, a control device 156, an adjustment device 158 and a load 160. The transmission device 152 can communicate with the transmission device 120 in a wireless manner, and receive and transmit carrier signals through the transmission device 120 . The rectifying device 154 is coupled to the transmission device 152, receives the carrier signal, and rectifies the carrier signal to generate a rectified signal. The control device 156 is coupled to the rectifier device 154 and receives the rectified signal to operate. The adjustment device 158 is coupled to the rectification device 154 and the control device 156, receives the rectification signal, and adjusts the rectification signal according to the control of the control device 156, and adjusts the rectification signal. The rectified signal is provided to the load 160 so that the load 160 operates. In this embodiment, the rectifying device 154 is, for example, a rectifier, the control device 156 is, for example, a microcontroller, and the adjusting device 158 is, for example, a DC-DC regulator.

Furthermore, the sensing module 131 may include a sensing resistor 136, a current sensor 137, a voltage sensor 138 and a converter 139. The sensing resistor 136 is coupled between the switch module 132 and the inverter 121 of the transmission device 120 . The current sensor 137 is coupled to the sensing resistor 136, and senses the current flowing through the sensing resistor 136 (that is, the current of the inverter 121) to generate a current sensing signal.

The voltage sensor 138 is coupled to the coil unit 122 of the transmission device 120 and senses the voltage of the coil unit 122 to generate a voltage sensing signal. The converter 139 is coupled to the current sensor 137 , the voltage sensor 138 and the processing module 135 , receives the current sensing signal and the voltage sensing signal, and provides the current sensing signal and the voltage sensing signal to the processing module 135 , so that the processing module 135 can calculate the signal parameters accordingly. In this embodiment, the converter 139 is, for example, an analog-to-digital converter (ADC). In addition, the wireless power transmission device 110 further includes a power supply device 140 . The power supply device 140 is coupled to the switch module 132, the control module 133, the driving module 134, and the processing module 135, and provides a power signal.

The above describes the internal components of the electronic device 100 and their coupling relationships. The operation of the wireless power transmission device 110 will be explained below with a timing diagram. Figure 3 is an operation sequence diagram of a wireless power transmission device according to an embodiment of the present invention. Please refer to Figures 1 to 3. During the first soft start period T1, the control device 130 can generate a driving signal to the transmission device 120 to drive the transmission device 120. That is to say, the processing module 135 can control the driving module 134 and the control module 133 to generate driving signals to the transmission device 120 .

Then, during the measurement period T2, the control device 130 can measure the energy information of the transmission device 120 to generate a measurement result, and calculate the signal parameters based on the measurement result, where the energy information can be corresponding to the transmission device 120. It is caused by the distance D1 between the wireless power receiving device 150 and the wireless power receiving device 150 . For example, when the distance D1 between the transmission device 120 and the wireless power receiving device 150 is close, The energy message of the transmission device 120 is relatively large. When the distance D1 between the transmission device 120 and the wireless power receiving device 150 is relatively long, the energy information of the transmission device 120 is smaller. In addition, in this embodiment, the inverter 121 and the coil unit 122 can generate energy information in response to the driving signal.

In this embodiment, the measurement results may include measured current (such as the current of the inverter 121) or measured voltage (such as the voltage of the coil unit 122), and the signal parameters may include frequency, duty cycle or apply voltage. In addition, the frequency and duty cycle of the signal parameters may be parameters used to control the driving module 134 to generate the carrier signal. The applied voltage of the signal parameter may be a parameter used to control the control module 133 to generate a carrier signal.

In some embodiments, the frequency of the signal parameter is, for example, proportional to the measurement current or measurement voltage of the measurement result, as shown in Figure 4A. For example, when the control device 130 confirms that the measurement current or the measurement voltage of the measurement result is larger, it means that the distance D1 between the transmission device 120 and the wireless power receiving device 150 is closer, and the control device 130 generates a smaller signal accordingly. The high-frequency signal parameters are sent to the driving module 134 . When the control device 130 confirms that the measurement current or the measurement voltage of the measurement result is smaller, it indicates that the distance D1 between the transmission device 120 and the wireless power receiving device 150 is far, and the control device 130 generates a lower frequency signal accordingly. Parameters to driver module 134.

In some embodiments, the duty cycle of the signal parameter is inversely proportional to the measurement current or measurement voltage of the measurement result, as shown in Figure 4B. For example, when the control device 130 confirms that the measurement current or the measurement voltage of the measurement result is larger, it means that the distance D1 between the transmission device 120 and the wireless power receiving device 150 is closer to the control device 130, then the control device 130 will This generates lower duty cycle signal parameters to the driving module 134 . When the control device 130 confirms that the measurement current or the measurement voltage of the measurement result is small, it means that the distance D1 between the transmission device 120 and the wireless power receiving device 150 is far, and the control device 130 generates a higher duty cycle accordingly. signal parameters to the driving module 134.

In some embodiments, the applied voltage of the signal parameter is, for example, inversely proportional to the measurement current or measurement voltage of the measurement result, as shown in FIG. 4C . For example, when the control device 130 confirms the measurement result When the measured current or measured voltage is larger, it indicates that the distance D1 between the transmission device 120 and the wireless power receiving device 150 is closer, and the control device 130 generates a signal parameter with a lower applied voltage to the control module 133 accordingly. When the control device 130 confirms that the measurement current or the measurement voltage of the measurement result is larger, indicating the distance D1 between the transmission device 120 and the wireless power receiving device 150 , the control device 130 generates a signal parameter with a lower applied voltage accordingly. to control module 133.

Afterwards, during the second soft-start period T3, the control device 130 generates a carrier signal correspondingly according to the signal parameters obtained during the measurement period T2. That is to say, the control device 130 can generate a carrier signal corresponding to the above signal parameters according to the frequency, duty cycle and/or applied voltage of the signal parameters. For example, the control module 133 can generate a carrier signal based on the applied voltage of the signal parameters, and/or the driving module 134 can generate the carrier signal based on the frequency and/or duty cycle of the signal parameters.

Then, during the transmission period T4, the carrier signal generated by the control device 130 passes through the transmission device 120 and is transmitted to the wireless power receiving device 150. In this way, the control device 130 can know the distance between the transmission device 120 and the wireless power receiving device 150 based on the measurement results, and adaptively adjust the signal parameters to generate the corresponding carrier signal to generate a suitable carrier signal for wireless power reception. The device 150 thereby prevents the wireless power receiving device 150 from malfunctioning due to receiving a carrier wave with excessive energy, or the reception quality of the carrier signal being poor.

In this embodiment, the voltage of the driving signal is, for example, smaller than the voltage of the carrier signal. In addition, in this embodiment, the first soft-start period T1, the measurement period T2, and the second soft-start period T3 are, for example, shorter than the transmission period T4. For example, the first soft-start period T1 is, for example, less than or equal to 1/10 of the transmission period T4 (that is, T1≦(1/10)*T4), and the measurement period T2 is, for example, less than or equal to 1/10 of the transmission period T4. (That is, T2 ≦ (1/10) * T4). The second soft start period T3 is, for example, less than or equal to 1/10 of the transmission period T4 (that is, T3 ≦ (1/10) * T4). However, in the embodiment of the present invention Not limited to this.

Afterwards, after the control device 130 transmits the carrier signal to the wireless power receiving device 150 through the transmission device 120, the control device 130 can further detect whether there is a wireless power connection through the transmission device 120. A response message is received from the wireless power receiving device 150, where the response message is generated by the wireless power receiving device 150 in response to the carrier signal. That is to say, the control device 130 can detect that the wireless power receiving device 150 is close to the transmission device 120 (wireless power transmission device 110) or is far away from the transmission device 120 (wireless power transmission device 110).

When the control device 130 detects a response message, indicating that the door 170 has not been opened and the wireless power receiving device 150 is close to the transmission device 120 (wireless power transmission device 110), the control device 130 continues to provide a carrier signal to maintain the wireless power. Operation of receiving device 150 . When the control device 130 detects that there is no response message, indicating that the door 170 is opened and the wireless power receiving device 150 is away from the transmission device 120 (wireless power transmission device 110), the control device 130 will stop providing the carrier signal, for example, by soft closing mode stops providing the carrier signal.

FIG. 5 is a flow chart of an operating method of a wireless power transmission device according to an embodiment of the present invention. In step S502, during the first soft start period, a driving signal is generated to the transmission device to drive the transmission device. In step S504, during the measurement period, the energy information of the transmission device is measured to generate a measurement result, and the signal parameters are calculated based on the measurement result, where the energy information is the transmission device corresponding to the transmission device and the wireless power receiving device. resulting from the distance between them. In step S506, during the second soft start period, a carrier signal is generated correspondingly according to the signal parameters obtained during the measurement period. In step S508, during transmission, the carrier signal is modulated through the transmission device and transmitted to the wireless power receiving device.

In some embodiments, the above-mentioned measurement results include, for example, measured current or measured voltage, and the above-mentioned signal parameters include frequency, duty cycle or applied voltage. In some embodiments, the frequency of the signal parameter is proportional to the measurement current or measurement voltage of the measurement result, for example. In some embodiments, the duty cycle of the signal parameter is inversely proportional to the measurement current or the measurement voltage, for example. In some embodiments, the duty cycle of the signal parameter is inversely proportional to the measurement current or the measurement voltage, for example. In some embodiments, the voltage of the driving signal is, for example, smaller than the voltage of the carrier signal. In some embodiments, the first soft-start period, the measurement period and the second soft-start period are, for example, shorter than the transmission period. In some embodiments, when the distance between the transmitting device and the wireless power receiving device is closer, the energy message of the transmitting device is larger. When the distance between the transmitting device and the wireless power receiving device is longer, the energy information of the transmitting device is smaller.

FIG. 6 is a flow chart of an operating method of a wireless power transmission device according to another embodiment of the present invention. In this embodiment, steps S502 to S508 are identical or similar to steps S502 to S508 in Figure 5 . Please refer to the description of the embodiment in Figure 5 , so they will not be described again here.

In step S602, it is detected through the transmission device whether there is a response message from the wireless power receiving device, where the response message is generated by the wireless power receiving device in response to the carrier signal. When a response message is detected, step S604 is entered to continuously provide a carrier signal. When no response message is detected, step S606 is entered to stop providing the carrier signal.

In summary, the wireless power transmission device and its operating method disclosed in the present invention drive the transmission device by generating a driving signal to the transmission device during the first soft start period. During the measurement period, the energy information of the transmission device is measured to generate measurement results, and signal parameters are calculated based on the measurement results. During the second soft start period, a carrier signal is generated correspondingly according to the signal parameters obtained during the measurement period. During transmission, the carrier signal is modulated by the transmission device and transmitted to the wireless power receiving device. In this way, appropriate carrier signals can be effectively provided adaptively according to changes in the distance between the wireless power transmission device and the wireless power receiving device, thereby increasing convenience of use.

Although the present invention is disclosed above through embodiments, they are not intended to limit the scope of the present invention. Anyone with ordinary knowledge in the relevant technical field can make slight changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the appended patent application scope.

100: Electronic devices

110:Wireless power transmission device

120,152:Transmission device

121:Inverter

122: Coil unit

130,156:Control device

131: Sensing module

132:Switch module

133:Control module

134:Driver module

135: Processing module

136: Sensing resistor

137:Current sensor

138:Voltage sensor

139:Converter

140:Power supply unit

150:Wireless power receiving device

154: Rectifier device

158:Adjustment device

160:Load

Claims (20)

A wireless power transmission device includes: a transmission device; and a control device that generates a driving signal to the transmission device during a first soft start period to drive the transmission device, and measures the transmission during a measurement period. An energy message of the device to generate a measurement result, and calculate a signal parameter based on the measurement result, and generate a carrier signal correspondingly based on the signal parameter obtained from the measurement during a second soft start, and During a transmission period, the carrier signal is transmitted to a wireless power receiving device through the transmission device; wherein the energy message is generated by the transmission device in response to a distance between the transmission device and the wireless power receiving device. The wireless power transmission device of claim 1, wherein the transmission device includes: an inverter; and a coil unit coupled to the inverter to transmit the carrier signal to the wireless power receiving device; wherein, the inverter The coil unit generates the energy message in response to the driving signal. The wireless power transmission device of claim 1, wherein the control device includes: a sensing module that measures the energy information of the transmission device to generate the measurement result; a switch module that receives a power signal; a control module to control the switch module; a drive module; and a processing module to control the drive module and the control module to generate the drive signal, calculate the signal parameters based on the measurement results, and According to the signal parameters, the driving module and the control module are controlled to generate the carrier signal. The wireless power transmission device of claim 1, wherein the measurement result includes a measured current or a measured voltage, and the signal parameters include a frequency, a duty cycle and an applied voltage. The wireless power transmission device of claim 4, wherein the frequency of the signal parameter is proportional to the measured current or the measured voltage of the measurement result. The wireless power transmission device of claim 4, wherein the duty cycle of the signal parameter is inversely proportional to the measured current or the measured voltage of the measurement result. The wireless power transmission device of claim 4, wherein the applied voltage of the signal parameter is inversely proportional to the measurement current or the measurement voltage of the measurement result. For example, the wireless power transmission device of claim 1, wherein the control device further detects whether there is a response message from the wireless power receiving device through the transmission device, and when the control device detects the response message, the control device continues Provide the carrier signal, and when the control device detects that there is no response message, the control device stops providing the carrier signal, wherein the response message is generated by the wireless power receiving device in response to the carrier signal. The wireless power transmission device of claim 1, wherein the voltage of the driving signal is smaller than the voltage of the carrier signal. The wireless power transmission device of claim 1, wherein the first soft start period, the measurement period and the second soft start period are smaller than the transmission period. For example, the wireless power transmission device of claim 1, wherein when the distance between the transmission device and the wireless power receiving device is closer, the energy of the energy message of the transmission device is greater, and when the transmission device and the wireless power receiving device When the distance between receiving devices is longer, the energy message of the transmitting device is smaller. An operating method of a wireless power transmission device, including: generating a driving signal to the transmission device during a first soft start period to drive the transmission device; measuring an energy information of the transmission device during a measurement period, To generate a measurement result and calculate a signal parameter based on the measurement result, wherein the energy information is generated by the transmission device in response to the distance between the transmission device and a wireless power receiving device; During a second soft start period, a carrier signal is generated correspondingly according to the signal parameters obtained during the measurement period; and during a transmission period, the carrier signal is transmitted to the wireless power receiving device through the transmission device. The operating method of the wireless power transmission device of claim 12, wherein the measurement result includes a measured current or a measured voltage, and the signal parameter includes a frequency, a duty cycle or an applied voltage. The operating method of the wireless power transmission device of claim 13, wherein the frequency of the signal parameter is proportional to the measured current or the measured voltage of the measurement result. The operating method of the wireless power transmission device of claim 13, wherein the duty cycle of the signal parameter is inversely proportional to the measured current or the measured voltage of the measurement result. The operating method of the wireless power transmission device of claim 13, wherein the applied voltage of the signal parameter is inversely proportional to the measurement current or the measurement voltage of the measurement result. The operating method of the wireless power transmission device of claim 12 further includes: detecting through the transmission device whether there is a response message from the wireless power receiving device, wherein the response message is that the wireless power receiving device responds to the carrier signal. generated; when detecting the response message, continue to provide the carrier signal; and when detecting the absence of the response message, stop providing the carrier signal. The operating method of the wireless power transmission device of claim 12, wherein the voltage of the driving signal is smaller than the voltage of the carrier signal. The operating method of the wireless power transmission device of claim 12, wherein the first soft start period, the measurement period and the second soft start period are smaller than the transmission period. The operating method of the wireless power transmission device of claim 12, wherein when the distance between the transmission device and the wireless power receiving device is closer, the energy message of the transmission device is greater, and when the transmission device and the wireless power receiving device are closer, the energy message of the transmission device is greater. When the distance between the wireless power receiving devices is relatively long, the transmission device The energy of this energy message is smaller.

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